diff --git "a/LiiNi-coder/202510/09 PGM \354\210\253\354\236\220\354\235\230 \355\221\234\355\230\204.md" "b/LiiNi-coder/202510/09 PGM \354\210\253\354\236\220\354\235\230 \355\221\234\355\230\204.md"
new file mode 100644
index 00000000..8f9f14d9
--- /dev/null
+++ "b/LiiNi-coder/202510/09 PGM \354\210\253\354\236\220\354\235\230 \355\221\234\355\230\204.md"	
@@ -0,0 +1,23 @@
+```java
+class Solution {
+    public int solution(int n) {
+        int[] sum = new int[n + 1];
+        for(int i=1; i<=n; i++)
+            sum[i] = sum[i-1] + i;
+
+        int l = 0, r = 1, answer = 0;
+        while(l < r && r <= n){
+            int now = sum[r] - sum[l];
+            if(now == n){
+                answer++;
+                r++;
+            }else if(now < n)
+                r++;
+            else
+                l++;
+        }
+        
+        return answer;
+    }
+}
+```